Published November 2022, Pg. 15-19

Section: Well drilling

UOT: 622. 245. 7: 622. 279

DOI: 10.37474/0365-8554/2022-11-15-19

Analysis of prediction methods of pressure decrease under drill bit while pulling-out drilling tool

F.A. Akhundov Cand. in Tech. Sc. - Institute for Oil and Gas

The analysis of existing surveys associated with the occurrence of gas shows in the well drilling, for the elimination of which a great amount of cost and time spent has been carried out. The most widespread of them are the complications of gas shows while pulling-out of drilling tool from the well. It was revealed that to prevent such complications, it is necessary to reduce the pressure of drilling mud under the bit of pulled-out drill stem from the well.

Existing methods of reducing the fluid pressure under the drill bit of a pulled-out drilling tool lie in the fill-up of drilling mud through the borehole annulus with special fill-up devices. Therefore, the fill-up is conducted through various quantities of pulled-out flares.

Considering this, we offer a method of specification of reducing fluid pressure under the bit of pulled-out drill stem via squeezing the drilling mud through the drilling tubes. The fill-up period is defined from the graphics of continuous changes of shearing strength in time obtained during the periodic deterioration of structure in the moments of a maximum value of shearing strength via stirring the drilling mud in shearing rates corresponding to the speed of pulling-out of drilling tool. The maximum value of the shearing strength is specified via the dependence provided

References:

1. Seid-Rza M.K., Faradzhev T.G., Gasanov R.A. Preduprezhdenie oslozhneniy v kinetike burovykh protsessov. – M.: Nedra, 1991, 272 s.

2. Ivannikov V.I. Prikhvaty buril´nogo instrumenta v skvazhine // Stroitel´stvo neft. i gaz. skvazhin na sushe i na more. – M.: 1996, No 1-2, s. 42-48.

3. Bulatov A.I. “Tamponazhnye materialy i tekhnologiya tsementirovaniya skvazhin”. – M.: Nedra, 1982, s. 18-19.

4. Rayen Calnn, H.C.H. Darley, George R. Gray. The composition and properties of drilling agents (flushing fluids). Elsevier, 2011, s. 632.

5. Shevtsov V.D. Preduprezhdenie gazoproyavleniy i vybrosov pri burenii glubokikh skvazhin. – M.: Nedra, 1985, s. 56.

6. Luk´yanov E.E., Strel´chenko V.V. Geologo-tekhnologicheskie issledovaniya v protsesse bureniya. – M.: Neft´ i gaz, 1997, s. 688.

7. Pat. US No 8077545 B2. Method for detecting gas influx in wellbores and its application to identify gas bearing formations. Publication December 13, 2011. Inventors- Werner M. Heigl.

8. Pat. US No 2008/0047337 A1. Early kick detection in an oil and gas well. Inventors – Roland E. Chemali, Volker Krueger, Rocco Di Foggio. Publication February 28, 2008.

9. Pat. US No 2012/0170406 A1. Early kick detection in an oil and gas well. Inventors-Rocco Di Foggio, Daniel Duncan Blue. Publication July 05, 2012.

10. Basarygin Yu.M., Budnikov V.F., Bulatov A.I. Teoriya i praktika preduprezhdeniya oslozhneniy i remonta skvazhin pri ikh stroitel´stve i ekspluatatsii. Spravochnoe posobie v 6 t., 2001. – M.: ООО “Nedra-Biznestsentr”, t. 3, 399 s.

11. Chabayev L.U., Chudnovskiy D.M., Khlebnikov S.R. Fontanoopasnost´ pri burenii, ekspluatatsii i remonte skvazhin. – Krasnodar: Prosveshchenie-Yug, 2009, 267 s.

12. Golovko V.N. Oborudovanie dlya prigotovleniya i ochistki promyvochnykh zhidkostey. – M.: Nedra, 1978, s. 118.

13. А.С. No 643629 US, Кl. Е 21В, 21/08. Ustroistvo promyvochnoy zhidkosti v skvazhinakh. E.S. Bakhromi, M.V. Posikera, A.K. Rakhimov i dr. Opubl. B.I. 1978, No 30.

14. А.С. No 1067193 SU. Sposob doliva rastvorom v protsesse pod´yoma buril´nogo instrumenta. A.A. Nezhel´skiy, E.I. Babayev Kl. Е 21В, 21/08 1982. Opubl. B.I. 1984, No 1.

15. А.С. No 1663176 SU, Kl. Е 21В, 21/08. Sposob predotvrashcheniya gazoproyavleniy pri podyome buril´nogo instrumenta. M.K. Seid-Rza, F.A. Akhundov, Kh.Ya. Rashidov. Opubl. B.I. 1991, No 26.

16. А.С. No 1285353 SU, Kl.G 01 N, 11/14. Ustroistvo dlya izmereniya staticheskogo napryazheniya sdviga tiksotropnykh zhidkostey. M.K. Seid-Rza, F.A. Akhundov, Kh.Ya. Rashidov. Opubl. B.I. 1987, No 3.